Display screen or portion thereof with a graphical user interface



A portion of the disclosure of this patent document contains material which a claim for copyright is made. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the US Patent and Trademark Office patent file or records, but reserves all other copyrights whatsoever.

FIGURE is a front view of a display screen or portion thereof with a graphical user interface.

The outer broken line showing the display screen or portion thereof forms no part of the claimed design. The inner broken lines showing portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 